<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <div id="app">
        <input v-model="newTodo"
        placeholder="add to todo"
        v-on:keyup.enter="addTodo"
        >
        <ul>
            <li v-for="(item, index) in todos">{{ item }} <button v-on:click="remove(index)">X</button></li>
        </ul>
    </div>
    <script src="../js/vue.js" charset="utf-8"></script>
    <script type="text/javascript">
        var vm = new Vue({
            el: '#app',
            data: {
                newTodo: '',
                todos: [
                    'hello world',
                    'because of you'
                ]
            },
            methods: {
                addTodo: function () {
                    this.todos.push(this.newTodo);
                    this.newTodo = '';
                },
                remove: function (index) {
                    this.todos.splice(index, 1)
                }
            }
        })
    </script>
</body>
</html>
